Question

Which of the following will show Tyndall effect ? Why ?
(a) Salt solution
(b) Starch solution
(c) Milk
(d) Copper sulphate solution

Answer 1

In the given options, starch solution and milk will show Tyndall effect because they are examples of colloidal solution. They have considerable size of particles that can cause scattering of light and make it visible. On the other hand, salt solution and copper sulphate solution are examples of true solutions. Abiding by the properties of true solution, they cannot scatter light as the size of their particles is very small; hence, they cannot show Tyndall effect.